header{
    width: 100%;
    height: .5rem;
    background-color:#1d6dff;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 .1rem;
    .back{
        text-align: center;
        line-height: .5rem;
        a{
            height: 0.4rem;
        width: 0.4rem;
            font-size: .20rem;
            color: #fff;
        }
    }
    h1{
        font-size: .20rem;
        font-weight: 900;
        color: #fff;
    }
    .app{
        a{
            display: block;
            img{
                height: .34rem;
                width: .34rem;
            }
        }
    }
}